Umbilical cart and system

ABSTRACT

Disclosed is a conduit cart for supporting conduits above at least one rail. The conduit cart has a base; and at least two right-side protrusions, namely, a right-side sub-rail protrusion extending horizontally from the base; and a right-side super-rail protrusion extending horizontally from the base. The right-side sub-rail protrusion and right-side super-rail protrusion are adapted to straddle a flange of a first rail and the first rail is one among the at least one rail. Further, the base has at least two left-side protrusions, namely, a left-side sub-rail protrusion extending in a direction opposite to the right-side sub-rail protrusion from the base; and a left-side super-rail protrusion extending to the right-side super-rail protrusion from the base. The left-side sub-rail protrusion and left-side super-rail protrusion can straddle a substantially horizontal flange of a second rail, and the second rail is among the at least one rail.

BACKGROUND

The present invention relates to cable and other filament management andmore specifically to supporting conduits extending from a fixed utilityconnection.

Deployment of modern drilling rigs accomplish great utility from a verylimited operating footprints by drilling multiple boreholes within atract of the surface estate. Subsequent drilling can be diagonal orlateral in order to reach hydrocarbon bearing formations that arescattered from the main drilling site. Nevertheless, at the conclusionof making a borehole, the drilling rig must be moved laterally toinitiate another borehole. This movement permits the vibrations anddrilling tools to penetrate the top layers of earth without impactingoperations at a previously made borehole.

Moving a drilling rig can be labor intensive and create a period where adrill bit makes no downward progress toward the target formation. Duringthis time, the drill bit is idle and site technicians that move thedrill string through the borehole are also idled. This gap in apparentproductivity is caused by the need to disconnect utilities and effluentpipes while a rig is moved. Further delays occur due to moving ofconduits including fluid carrying conduits into position to where therig is being moved. Moreover, at such new positions, these conduits needto be reconnected in a safe manner.

Further difficulties can occur when the conduits create new ground-levelobstacles to moving people and equipment to the rig, as can occur ifelectrical cables are left on the ground. Such a location for conduitsgenerally increases risks of trips and other injuries, as well aspotential to accidentally sever such cables.

Accordingly, some remedy to the above-described deficiencies is desired.

SUMMARY

According to one embodiment of the present invention discloses conduitcart for supporting at least one conduit above at least one rail. Theconduit cart has a base; and at least two right-side protrusions,namely, a right-side sub-rail protrusion extending horizontally from thebase; and a right-side super-rail protrusion extending horizontally fromthe base. The right-side sub-rail protrusion and right-side super-railprotrusion are adapted to straddle a substantially horizontal flange ofa first rail and the first rail is one among the at least one rail.Further, the base has at least two left-side protrusions, namely, aleft-side sub-rail protrusion extending in a direction opposite to theright-side sub-rail protrusion from the base; and a left-side super-railprotrusion extending in a direction opposite to the right-sidesuper-rail protrusion from the base. Further, the left-side sub-railprotrusion and left-side super-rail protrusion are adapted to straddle asubstantially horizontal flange of a second rail, and the second rail isone among the at least one rail. A vertical support extends upwards fromthe base.

BRIEF DESCRIPTION OF THE SEVERAL VIEWS OF THE DRAWINGS

FIG. 1 is a block diagram of a cross-section to an I-beam that may beused as a rail utilized by one or more illustrative embodiments of theinvention;

FIG. 2 is a elevation view of plural carts used to elevate a conduit inaccordance with an embodiment of the invention;

FIG. 3 is an isometric view of a cart in accordance with an embodimentof the invention; and

FIG. 4 is a further isometric view of a cart in accordance with anotherembodiment of the invention.

DETAILED DESCRIPTION

FIG. 1 is a block diagram of a cross-section to an I-beam that may beused as a rail utilized by one or more illustrative embodiments of theinvention. Rail 100 can be used to guide cart embodiments along a linethat extends generally from a fixed bulkhead where utility and otherconduits are available. Rail 100 can reach to and under a drilling rigand, through the cooperation of multiple carts, offer a means to guideone or more conduits to the rig regardless of rig location along theline of current and planned borehole locations. Rail 100 can be placedin parallel with an additional rail if further stability is desired forcarts that can ride on such rails.

Rail 100 may rest on terrain, or improved rail-bed using lower surface105 to bear the weight of the rail and any supporting apparatus. Flange101 and/or Flange 103 can provided a guide for a cart that hashorizontally extending protrusions above and below a flange. Theprotrusions, in some embodiments may be wheels that each rotate about anaxle. The placement of wheels or other protrusions below the flange andgenerally below corresponding protrusions above the flange, can providestability for a cart and attendant conduit, especially in high windconditions.

FIG. 2 is a elevation view of plural carts used to elevate a conduit inaccordance with an embodiment of the invention. Rail 200 can be placedalong terrain from conduit bulkhead 210 to and beyond the currentlocation of rig 220. Conduit 230 may attach at conduit bulkhead 210 andbe draped over plural carts to reach hitched cart 251 that permits theconduit to climb on cable tray 253 and cable tray 255. Cable tray 253and cable tray 255 may be considered a single cable tray having firstend 250 and second end 260, with a joint at or near its center, such as,for example, joint 254. Once the conduit reaches rig 220, it may besemi-permanently attached with comparatively low tension exerted at therig, as compared to tension placed on the conduit between carts. Thetension of conduit at the rig is less than 100 pounds.

Cart 221, cart 231 and cart 241 may be placed sufficiently close to eachother, that conduit drapes down toward rail 200. However, one or moresuspensions of conduit can be elevated so that the lowest point of sagis above the heads of workers. Accordingly, relatively unobstructedpassage under the conduit may be obtained in such a configuration. Aheight of the arched conduit-support surface from the rail is thetangential distance from the top of the rail to the most distant part ofthe arched conduit-support surface, excluding any edges or slots thatmay provide restrictions to lateral movement. Lateral movement isgenerally horizontal movement tangential to the rail. The height of thearched conduit-support surface can be, for example, nine feet, whichallows for 2.5 feet of sagging between arched conduit-support surfacesof adjacent carts. Sags of that much or less generally are above theheads of service personnel that might be operating near the conduits.

Hitched cart 251 can be attached to rig 220 via cable trays and viatow-bar 270. Tow-bar 270 may provide a rigid means of transmitting forcefrom a rig that is moving to a new drilling location. As such, tow-barmay attach to hitched cart 251 by a tow-bar attachment point. A tow-barattachment point is a hitch, axle or other latching mechanism that mayextend from a trailer cart, for example, as depicted in FIG. 4, below.It is appreciated that some rigs may have means to provide strain reliefto conduits that do not rely on a hitched cart. Accordingly, in someembodiments, conduit may be flexibly attached using one or more cartssuch as carts 221, 231 and 241.

FIG. 2 shows conduit draped over plural carts where the conduit issupported by arched conduit-support surfaces. An arched conduit-supportsurface is a part of a cart that provides weight bearing support for oneor more conduits. The conduit-support surface may also provide lateralfriction or other securing means to prevent wind or other forces fromknocking the conduit from atop the arched conduit-support surfaces.

FIG. 3 is an isometric view of a cart in accordance with an embodimentof the invention. A cart is a device that is oriented in a generallyupright direction when placed on one or more parallel rails. Cartincludes base 301. A base is a generally horizontal assembly thatprovides a rigid platform for vertical support 305. A vertical supportextends vertically above a base to provide vertical and lateral supportto conduits that may be placed atop the vertical support, for example,on arched conduit-support surface 309. Arched conduit-support surface309 allows conduit to drape from lip 311 and from lip 313 in positionsthat can be a vertical segment 261 or as a tensioned horizontal segment263, as shown in FIG. 2, above. A lip is the lowest hanging part of thearched conduit-support surface. The lip may provide strain relief for acable as it hangs in a low tension state. The lips may, accordingly,have tangents that are vertical, which may match the direction of aloose cable and/or conduit as it hangs from a lip.

Base 301 is supported by at least protrusions that extend outward fromthe base and tangential to a rail. FIG. 3 shows first right-sidesuper-rail protrusion 351 and second right-side super rail protrusion355. These protrusions may be placed atop a rail flange. Below the rail,the base may extend a right-side sub-rail protrusion 353. The flange maythus be sandwiched between the opposing wheels so that the right side ofthe cart neither collapses into the terrain nor is tipped by operationof wind or other lateral forces.

On the left side of the cart, similar protrusions may extend. Theseleft-side protrusions are not shown in FIG. 3. These protrusions may bein corresponding, but opposing, orientations to first right-sidesuper-rail protrusion, second right-side super-rail protrusion andright-side sub-rail protrusion. Accordingly, a first left-sidesuper-rail protrusion, second left-side super-rail protrusion andleft-side sub-rail protrusion may engage with a second rail thatgenerally parallels rail 200 of FIG. 2.

Each protrusion may be cylindrical or bear a wheel on an axle.Alternatively, one or more protrusions may lack a wheel or even be flaton a side facing the flange. In either case, the protrusions mayslidably engage a rail flange, and in particular, permit longitudinalmovement of carts along the one or more rails that lead to the rig.Among the super-rail protrusions, each embodiment can have at least onesuch super-rail protrusion on a side, while the additional secondsuper-rail protrusion is an optional feature. In situations where aprotrusion includes a wheel, these wheels may be called left-side wheelsor right-side wheels. A wheel is super-rail, if it is oriented to beplaced above the rail. A wheel is sub-rail if it oriented to be placedbelow the rail.

A cart width is a distance between an outermost right-side sub-railprotrusion and an outermost left-side sub-rail protrusion that arecoaxial, one to the other. A cart width can be one fifth or less ascompared to a vertical support height. A vertical support height is adistance from sub-rail protrusion to a top of an arched conduit-supportsurface. A maximum clearance distance from the track-level is a distancethat a conduit lies from a rail when the conduit is on the top of anarched conduit-support surface. A track level, is the upper-most pointon a track upon which a cart rides.

A conduit may be an electrical cable. An electrical cable is a cablethat carries electricity along a conductor and has at least oneinsulator that jackets the conductor. A helical bias is a tendency of aconduit to spiral or curve in a direction that results in a helixpattern in the coil when suspended between points of less than fivefeet. The helical bias can be that the conduit coils around an axis witha radius of more than one centimeter. An electrical cable can have ahelical bias. Any cable bias that is of a radius greater than 50 cm isincidental to cable storage, and is not considered to be an effectivebias in an environment where fewer than 20 meters of cable drape betweencarts. Nevertheless, some embodiments may include a conduit that can bean electrical cable that is substantially unbiased from being helical.

Conduits have limited tensile strength. Accordingly, it is desirable todistribute the tension placed on segments of conduit so that no singledraped segment exceeds a tolerance. To provide for limited traveldistance between carts, each cart is provided with tether posts. Tetherpost 361 and tether post 363 permit a high tensile strength cables to beattached that extend, on one hand, upstream to a next cart or otherpost, and on the other hand, downstream to a next cart or other post. Atether post is an eyelet, post, or other sturdy attachment point thatmay be suitable to admit a carabineer or other loop at an end to acable. Additional tether posts may be placed on the hidden side of cart300. Typically, when deploying a cart system, each segment of conduit issomewhat longer than the high tensile strength cables. A cable is hightensile strength if it can bear more tension without damage than aninsulated electricity carrying conduit placed on the cart system.Accordingly, if one cart is pulled in a manner that brings the nearbycable segment nearly horizontal, the high tensile strength cable pullsthe neighboring cart closer in a manner to more evenly distribute thetension among conduit segments.

An umbilical system includes at least two carts. Such carts can be, forexample, as shown in FIG. 2 as cart 231 and cart 241. Further, the cartscan include trailer cart 251. In each case, the umbilical system caninclude one or more portions of conduit suspended from the carts. Alength of conduit suspended between carts is the length of the conduitfrom arched conduit-support surfaces of adjacent carts or from an archedconduit-support surface to a cable tray support. The length of theconduit suspended between carts can be less than three times a height ofthe first arched conduit-support surface from the rail.

FIG. 4 is a further isometric view of a cart in accordance with anotherembodiment of the invention. Cart 400 is a trailer cart, such as, forexample, trailer cart 251 of FIG. 2. Cart 400 includes base 401. Base401 can include a first right side sub rail protrusion 405 and a secondright side sub-rail protrusion 407. Further extensions from the rightside of base 401 can include a first right side super-rail protrusion403 and a second right-side super-rail protrusion 409. It is appreciatedthat fewer than two right-side sub-rails may be used or more than twomay be used. Each super-rail protrusion or wheel is at a level higherthan the a sub-rail protrusion or wheel height

The one or more right side sub-rail protrusion and the right sidesuper-rail protrusion are adapted to straddle a substantially horizontalflange, for example, flange 101 of FIG. 1. The base may also haveleft-side protrusions that project from the left side of the base, notshown in FIG. 4.

Vertical support 450 can extend upwards from the base. Attached tovertical support 450 may be cable tray 460. Cable tray 460 can rotateabout axis 461 to accommodate rigs of varying heights. Cable tray canbe, for example, cable tray 253 and 255 of FIG. 1. Cable tray 460attaches to vertical support 450 by cable tray support 459. The cabletray support is connected to a first end of a cable-tray.

Cable tray dock 491 is provided to permit cable tray 460 to attach tothe cart. Cable tray 460 may be secured through an axle extending alongaxis 461. Optional serpentine routing of cables may be placed throughcable posts 496. Such routing can provide friction that prevents a cablefrom having too much slack as it climbs the cable tray and extends offthe cart to a neighboring cart. As such, the cart admits an end of acable-tray in rotational engagement substantially at a top of thevertical support.

Further tether posts may be provided to cart 400 to provide protectionagainst inadvertent breakage of the cable segments. For example, tetherpost 471 can provide a tether to the next upstream cart. An additionaltether post is hidden on the hidden side of cart 400.

Cart 400 may have tow-bar attachment point capable of accepting a towdevice for transmitting force substantially along one or more rails. Atow device can be a rigid bar extending from a mobile drilling rig. Atow device can be a chain or other flexible connector that attaches to amobile drilling rig. Tow-bar attachment point 480 may be a post, hitchor other attaching or latching means extending from vertical support450. Alternatively, tow-bar attachment point may attach to base 401.

Accordingly, one or more embodiments may permit the support of conduitsabove a rail in a manner that may permit draped cables to be pulledtaught in individual segments that can clear the heads of workers thatoperate a drilling rig. As such, the slack conduit so-draped, can beextended to permit zones of relatively unobstructed passage without theneed to disconnect or reconnect the conduits in response to moving thedrilling rig along a line of linearly placed boreholes.

Embodiments presented herein are illustrative and show examples of howfeatures and limitations may be combined. Still further embodiments arewithin the spirit and scope of the invention described by the followingclaims.

What is claimed is:
 1. An umbilical system for providing utilities to arig by suspending conduit above at least one rail, the umbilical systemcomprising: a cart capable of elevating a first portion of conduit amaximum clearance distance from a level of the at least one rail, thefirst cart comprising: a base; at least two right-side wheels forslidably engaging a first rail among the at least one rail, each wheelhaving an axle; at least two left-side wheels for slidably engaging asecond rail among the at least one rail, each wheel having an axle; anda pair of substantially vertical supports attached to the base, the pairof substantially vertical supports supporting, at or near distal topends to each of the pair of substantially vertical supports, an archedconduit-support surface entirely above the at least one rail, whereinthe arched conduit-support surface exposes a convex surface upwards andhaving lips that droop downward the second rail is substantiallyparallel to the first rail.
 2. The umbilical system of claim 1, furthercomprising: a conduit suspended by the arched conduit-support surface.3. The umbilical system of claim 2, wherein the conduit has a helicalbias.
 4. The umbilical system of claim 2, wherein the conduit lacks ahelical bias.
 5. The umbilical system of claim 2 wherein the height ofthe arched conduit-support surface from the rail is at least nine feet.6. The umbilical system of claim 2, wherein an end of the conduit isavailable at a rig, with tension of less than 100 pounds.
 7. A conduitcart for supporting at least one conduit above at least one rail, theconduit cart comprising: a base; a right-side sub-rail protrusionextending horizontally from the base; a right-side super-rail protrusionextending horizontally from the base; wherein the right-side sub-railprotrusion and right-side super-rail protrusion are adapted to straddlea substantially horizontal flange of a first rail and the first rail isone among the at least one rail; a left-side sub-rail protrusionextending in a direction opposite to the right-side sub-rail protrusion,the left-side sub-rail protrusion extending from the base; a left-sidesuper-rail protrusion extending in a direction opposite to theright-side super-rail protrusion, the left-side super-rail protrusionextending from the base, wherein the left-side sub-rail protrusion andleft-side super-rail protrusion are adapted to straddle a substantiallyhorizontal flange of a second rail, and the second rail is one among theat least one rail; a vertical support extending upwards from the base;and a cable tray dock attached on or above the vertical support, thecable tray dock in rotational engagement with a first end of a cabletray, wherein a cable tray extends from the cable tray dock, wherein thecable tray has at least one joint between a first end of the cable trayand a second end of the cable tray, the joint permitting rotation of thesecond end.
 8. The conduit cart of claim 7, wherein the right-sidesub-rail protrusion comprises at least one right wheel mounted to anaxle extending from the base; the right-side super-rail protrusioncomprises at least one second super-rail right wheel mounted to an axleextending from the base at a level higher than the first at least oneright wheel, and parallel to the first at least one right wheel; theleft-side sub-rail protrusion comprises at least one right wheel mountedto an axle extending from the base; the left-side super-rail protrusioncomprises a second left super-rail wheel mounted to an axle extendingfrom the base at a level higher than the first left wheel.
 9. Theconduit cart of claim 8, wherein the at least one right super-rail wheelcomprises two right wheels, and the at least one right sub-rail wheelcomprises two right wheels.
 10. The conduit cart of claim 7, furthercomprising a tow-bar attachment point capable of accepting a tow devicefor transmitting force substantially along the first rail.
 11. Theextendable conduit cart of claim 10, wherein the conduit cart comprisesan electrical cable that is substantially unbiased from being helical.